EXTREME COLD WEATHER POLYPROPYLENE LONG UNDERWEAR- PANTS and / or SHIRT

POLYPROPYLENE LONG UNDERWEAR. This is the heart of the GI ECWCS (Extended Cold Weather Clothing System) Shirt features: soft fleece lining zippered turtle neck collar, and elastic cuffs. Pants feature: soft fleece lining, elastic leg cuffs and waist band, and reinforced flap fly.

Source: http://www.imsplus.com/index.php?target=products&product_id=30356

Gunnery Sergeant Airman Private Basic USAF